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/*
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
/* Using the mount protocol, lookup NAME at host HOST.
Return a netnode for or null for an error. */
struct netnode *
mount_root (char *name, char *host)
{
error_t err;
struct sockaddr_in addr;
struct hostent *h;
struct servent *s;
int *p;
void *rpcbuf;
error_t err;
int port;
/* Lookup the portmapper port number */
s = getservbyname ("portmap", "udp");
if (!s)
{
fprintf (stderr, "portmap/udp: unknown service\n");
return 0;
}
/* Lookup the host */
h = gethostbyname (host);
if (!h)
{
herror (host);
return 0;
}
addr->sin_family = h->h_addrtype;
bcopy (h->h_addr_list[0], &addr.sin_addr, h->h_length);
addr->sin_port = htons (s->s_port);
/* Formulate and send a PMAPPROC_GETPORT request
to lookup the mount program on the server. */
p = pmap_initialize_rpc (PMAPPROC_GETPORT, &rpcbuf);
*p++ = htonl (MOUNT_RPC_PROGRAM);
*p++ = htonl (MOUNT_RPC_VERSION);
*p++ = htonl (IPPROTO_UDP);
*p++ = htonl (0);
err = conduct_rpc (&rpcbuf, &p);
if (err)
{
perror ("portmap of mount");
return 0;
}
/* Fetch the reply port and clean the RPC */
port = ntohl (*p++);
addr->sin_port = htons (port); /* note that htons and ntohl are not inverses */
free (rpcbuf);
/* Now talking to the mount program, fetch the file handle
for the root. */
p = mount_initialize_rpc (MOUNTPROC_MNT, &rpcbuf);
p = xdr_encode_string (p, name);
err = conduct_rpc (&rpcbuf, &p);
if (err)
{
perror (name);
return 0;
}
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